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Oxyodes Guenée

Type species: scrobiculata Fabricius, India.

Species of Oxyodes have triangular forewings with irregular fasciation and a large reniform stigma. The hindwings are characteristically yellower with the costal half black, the black curving slightly round distally before being reduced to two to three narrow and irregular fasciae; a similar fascia may be present also interior to these. There is a variably sized black patch on the forewing underside near the tornus. The male antennae are ciliate. Females usually have heavier markings on the underside. There is a ‘pseudepaulette’ in the tympanal cavity, and a similar feature is found in Catephia Ochsenheimer (p. 84); this is not considered homologous with that seen in trifine noctuid subfamilies (Speidel et al., 1996a).

The male abdomen has the eighth segment unmodified. The genitalia have features that are consistent with association with the Ophiusini, particularly the valve which has a massive process from the base of the costa with a ventral connection to the apical part of the sacculus; it also has a long corema at the base. The uncus is accompanied by a scaphium. The juxta is of the inverted ‘Y’ type. The aedeagus has a small, unornamented but convolute vesica.

The female genitalia have the seventh sternite reduced, very narrow, and it appears fused posteriorly with the ostium which itself gives rise to a slender spine on each side. The sides of the seventh tergite are rounded and closely associated with the sternite. The ductus is sclerotised up to the neck of the corpus bursae where the ductus seminalis is situated on a slight swelling. The neck distal to this remains narrow before expanding into a pyriform distal part that has a weak area of scobination on one side.

The genus consists of the type species and the Australian
O. tricolor Guenée. There is also O. ochracea Pagenstecher from Ambon in the Moluccas, but this could be merely a further race of the type species.

The biology of the type species is described below; the larva is also of the general ophiusine type.

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